[time-nuts] Re: Will a TADD-2 work with 50 MHz input?

[Andy Talbot]

I've had 20MHz PICs clocking OK at 35MHz at room temperature, and IIRC one
went OK up to 43MHz.

Andy
www.g4jnt.com



On Thu, 26 Sept 2024 at 16:38, Bob Camp via time-nuts <
time-nuts at lists.febo.com> wrote:

> Hi
>
> Even with an ice cube …. not so much.
>
> You don’t just want it to divide. You want it to divide and be reasonably
> low noise.
>
> Likely cheapest alternative would be some sort of add on board done at
> JLPCB.
> (so no, not off the shelf ….).
>
> Bob
>
> > On Sep 25, 2024, at 9:30 PM, John Ackermann N8UR via time-nuts <
> time-nuts at lists.febo.com> wrote:
> >
> > Hi Jim --
> >
> > The PICs used in the TADD-2 and TADD-2 Mini are rated for a maximum
> external clock of 20 MHz.  So, 50 MHz probably won't work, unless maybe you
> set an ice cube on top of the IC. :-)
> >
> > John
> > ----
> >
> > On 9/25/24 20:51, Jim Lux via time-nuts wrote:
> >>
> >> I have a 50 MHz oscillator I want to measure, and I have a TICC and a
> 10 MHz source (to run the TICC) and a good 1pps.  I assume that if I divide
> the 50 down to 5 (e.g. with the TADD-2) I can do the measurement.  The
> question is whether the TADD (or some other inexpensive off the shelf
> thing) can handle that high an input frequency.
> >> Or, is that pushing the PIC beyond its limits?
> >> Same sort of question for 100 MHz.
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